Magnet Exciting Coils

Magnet exciting coils which have been built at the Cambridge Electron Accelerator are described. The paper gives the indices used in designing the coils, and evaluates the properties of various types of insulation. The fields obtained in bending magnets and in quadrupole magnets have been measured, and the magnetic efficiencies of the flux circuits are recorded. Designs of some unique coils will be shown, which include the following: The exciting coils on the alternating gradient magnets of the accelerator, the coils on the choke that powers the accelerator, a bending magnet, a quadrupole magnet, and the large solenoid coil on a spark chamber magnet.